Continuous Random Variables That Can Assume Values at All Points

Continuous random variables that can assume values at all points on an interval of values, with no breaks between possible values, are quite common. Which of the following items could NOT be classified as a continuous random variable?

A) profit per dollar of sales
B) cost per credit taken by graduate students
C) the average time it takes to assemble a car, or write a test
D) heights of human beings rounded to the nearest inch

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